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  Created by IntelliJ IDEA.
  User: 联想
  Date: 2020/3/29
  Time: 22:19
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<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<!doctype html>
<html>
<head>
    <meta charset="utf-8">
    <title>HTML5仿超级玛丽小游戏源码</title>

    <style>
        body {
            background: #222;
        }

        h2 {
            color: #666;
            font-family: monospace;
            text-align: center;
        }

        .background {
            table-layout: fixed;
            border-spacing: 0;
        }

        .background td {
            padding: 0;
        }

        .lava, .actor {
            background: #e55;
        }

        .wall {
            background: #444;
            border: solid 3px #333;
            box-sizing: content-box;
        }

        .actor {
            position: absolute;
        }

        .coin {
            background: #e2e838;
            border-radius: 50%;
        }

        .player {
            background: #335699;
            box-shadow: none;
        }

        .lost .player {
            background: #a04040;
        }

        .won .player {
            background: green;
        }

        .game {
            position: relative;
            overflow: hidden;
        }
    </style>
</head>
<body>

<h2>简单的JavaScript游戏</h2>

<script>
    var LEVELS = [
        ["                                                                                ",
            "                                                                                ",
            "                                                                                ",
            "                                                                                ",
            "                                                                                ",
            "                                                                                ",
            "                                                                  xxx           ",
            "                                                   xx      xx    xx!xx          ",
            "                                    o o      xx                  x!!!x          ",
            "                                                                 xx!xx          ",
            "                                   xxxxx                          xvx           ",
            "                                                                            xx  ",
            "  xx                                      o o                                x  ",
            "  x                     o                                                    x  ",
            "  x                                      xxxxx                             o x  ",
            "  x          xxxx       o                                                    x  ",
            "  x  @       x  x                                                xxxxx       x  ",
            "  xxxxxxxxxxxx  xxxxxxxxxxxxxxx   xxxxxxxxxxxxxxxxxxxx     xxxxxxx   xxxxxxxxx  ",
            "                              x   x                  x     x                    ",
            "                              x!!!x                  x!!!!!x                    ",
            "                              x!!!x                  x!!!!!x                    ",
            "                              xxxxx                  xxxxxxx                    ",
            "                                                                                ",
            "                                                                                "
        ],
        ["                                      x!!x                        xxxxxxx                                    x!x  ",
            "                                      x!!x                     xxxx     xxxx                                 x!x  ",
            "                                      x!!xxxxxxxxxx           xx           xx                                x!x  ",
            "                                      xx!!!!!!!!!!xx         xx             xx                               x!x  ",
            "                                       xxxxxxxxxx!!x         x                                    o   o   o  x!x  ",
            "                                                xx!x         x     o   o                                    xx!x  ",
            "                                                 x!x         x                                xxxxxxxxxxxxxxx!!x  ",
            "                                                 xvx         x     x   x                        !!!!!!!!!!!!!!xx  ",
            "                                                             xx  |   |   |  xx            xxxxxxxxxxxxxxxxxxxxx   ",
            "                                                              xx!!!!!!!!!!!xx            v                        ",
            "                                                               xxxx!!!!!xxxx                                      ",
            "                                               x     x            xxxxxxx        xxx         xxx                  ",
            "                                               x     x                           x x         x x                  ",
            "                                               x     x                             x         x                    ",
            "                                               x     x                             xx        x                    ",
            "                                               xx    x                             x         x                    ",
            "                                               x     x      o  o     x   x         x         x                    ",
            "               xxxxxxx        xxx   xxx        x     x               x   x         x         x                    ",
            "              xx     xx         x   x          x     x     xxxxxx    x   x   xxxxxxxxx       x                    ",
            "             xx       xx        x o x          x    xx               x   x   x               x                    ",
            "     @       x         x        x   x          x     x               x   x   x               x                    ",
            "    xxx      x         x        x   x          x     x               x   xxxxx   xxxxxx      x                    ",
            "    x x      x         x       xx o xx         x     x               x     o     x x         x                    ",
            "!!!!x x!!!!!!x         x!!!!!!xx     xx!!!!!!!!xx    x!!!!!!!!!!     x     =     x x         x                    ",
            "!!!!x x!!!!!!x         x!!!!!xx       xxxxxxxxxx     x!!!!!!!xx!     xxxxxxxxxxxxx xx  o o  xx                    ",
            "!!!!x x!!!!!!x         x!!!!!x    o                 xx!!!!!!xx !                    xx     xx                     ",
            "!!!!x x!!!!!!x         x!!!!!x                     xx!!!!!!xx  !                     xxxxxxx                      ",
            "!!!!x x!!!!!!x         x!!!!!xx       xxxxxxxxxxxxxx!!!!!!xx   !                                                  ",
            "!!!!x x!!!!!!x         x!!!!!!xxxxxxxxx!!!!!!!!!!!!!!!!!!xx    !                                                  ",
            "!!!!x x!!!!!!x         x!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!xx     !                                                  "
        ],
        ["                                                                                                              ",
            "                                                                                                              ",
            "                                                                                                              ",
            "                                                                                                              ",
            "                                                                                                              ",
            "                                        o                                                                     ",
            "                                                                                                              ",
            "                                        x                                                                     ",
            "                                        x                                                                     ",
            "                                        x                                                                     ",
            "                                        x                                                                     ",
            "                                       xxx                                                                    ",
            "                                       x x                 !!!        !!!  xxx                                ",
            "                                       x x                 !x!        !x!                                     ",
            "                                     xxx xxx                x          x                                      ",
            "                                      x   x                 x   oooo   x       xxx                            ",
            "                                      x   x                 x          x      x!!!x                           ",
            "                                      x   x                 xxxxxxxxxxxx       xxx                            ",
            "                                     xx   xx      x   x      x                                                ",
            "                                      x   xxxxxxxxx   xxxxxxxx              x x                               ",
            "                                      x   x           x                    x!!!x                              ",
            "                                      x   x           x                     xxx                               ",
            "                                     xx   xx          x                                                       ",
            "                                      x   x= = = =    x            xxx                                        ",
            "                                      x   x           x           x!!!x                                       ",
            "                                      x   x    = = = =x     o      xxx       xxx                              ",
            "                                     xx   xx          x                     x!!!x                             ",
            "                              o   o   x   x           x     x                xxv        xxx                   ",
            "                                      x   x           x              x                 x!!!x                  ",
            "                             xxx xxx xxx xxx     o o  x!!!!!!!!!!!!!!x                   vx                   ",
            "                             x xxx x x xxx x          x!!!!!!!!!!!!!!x                                        ",
            "                             x             x   xxxxxxxxxxxxxxxxxxxxxxx                                        ",
            "                             xx           xx                                         xxx                      ",
            "  xxx                         x     x     x                                         x!!!x                xxx  ",
            "  x x                         x    xxx    x                                          xxx                 x x  ",
            "  x                           x    xxx    xxxxxxx                        xxxxx                             x  ",
            "  x                           x           x                              x   x                             x  ",
            "  x                           xx          x                              x x x                             x  ",
            "  x                                       x       |xxxx|    |xxxx|     xxx xxx                             x  ",
            "  x                xxx             o o    x                              x         xxx                     x  ",
            "  x               xxxxx       xx          x                             xxx       x!!!x          x         x  ",
            "  x               oxxxo       x    xxx    x                             x x        xxx          xxx        x  ",
            "  x                xxx        xxxxxxxxxxxxx  x oo x    x oo x    x oo  xx xx                    xxx        x  ",
            "  x      @          x         x           x!!x    x!!!!x    x!!!!x    xx   xx                    x         x  ",
            "  xxxxxxxxxxxxxxxxxxxxxxxxxxxxx           xxxxxxxxxxxxxxxxxxxxxxxxxxxxx     xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx  ",
            "                                                                                                              ",
            "                                                                                                              "
        ],
        ["                                                                                                  xxx x       ",
            "                                                                                                      x       ",
            "                                                                                                  xxxxx       ",
            "                                                                                                  x           ",
            "                                                                                                  x xxx       ",
            "                          o                                                                       x x x       ",
            "                                                                                             o o oxxx x       ",
            "                   xxx                                                                                x       ",
            "       !  o  !                                                xxxxx xxxxx xxxxx xxxxx xxxxx xxxxx xxxxx       ",
            "       x     x                                                x   x x   x x   x x   x x   x x   x x           ",
            "       x= o  x            x                                   xxx x xxx x xxx x xxx x xxx x xxx x xxxxx       ",
            "       x     x                                                  x x   x x   x x   x x   x x   x x     x       ",
            "       !  o  !            o                                  xxxx xxxxx xxxxx xxxxx xxxxx xxxxx xxxxxxx       ",
            "                                                                                                              ",
            "          o              xxx                              xx                                                  ",
            "                                                                                                              ",
            "                                                                                                              ",
            "                                                      xx                                                      ",
            "                   xxx         xxx                                                                            ",
            "                                                                                                              ",
            "                          o                                                     x      x                      ",
            "                                                          xx     xx                                           ",
            "             xxx         xxx         xxx                                 x                  x                 ",
            "                                                                                                              ",
            "                                                                 ||                                           ",
            "  xxxxxxxxxxx                                                                                                 ",
            "  x         x o xxxxxxxxx o xxxxxxxxx o xx                                                x                   ",
            "  x         x   x       x   x       x   x                 ||                  x     x                         ",
            "  x  @      xxxxx   o   xxxxx   o   xxxxx                                                                     ",
            "  xxxxxxx                                     xxxxx       xx     xx     xxx                                   ",
            "        x=                  =                =x   x                     xxx                                   ",
            "        xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx   x!!!!!!!!!!!!!!!!!!!!!xxx!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!",
            "                                                  xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx",
            "                                                                                                              "
        ]
    ];

    function Vector(x, y) {
        this.x = x;
        this.y = y;
    }

    Vector.prototype.plus = function(other) {
        return new Vector(this.x + other.x, this.y + other.y);
    };

    Vector.prototype.times = function(scale) {
        return new Vector(this.x * scale, this.y * scale);
    };

    // Note: uppercase words are used that means constructor are values
    var actorchars = {
        "@": Player,
        "o": Coin,
        "=": Lava,
        "|": Lava,
        "v": Lava
    };

    function Player(pos) {
        this.pos = pos.plus(new Vector(0, -.5));
        this.size = new Vector(.5, 1);
        this.speed = new Vector(0, 0);
    }
    Player.prototype.type = "player";

    function Lava(pos, ch) {
        this.pos = pos;
        this.size = new Vector(1, 1);
        if (ch === "=")
            this.speed = new Vector(2, 0);
        else if (ch === '|')
            this.speed = new Vector(0, 2);
        else if (ch === 'v') {
            this.speed = new Vector(0, 3);
            this.repeatPos = pos;
        }
    }
    Lava.prototype.type = "Lava";

    function Coin(pos) {
        this.basePos = this.pos = pos;
        this.size = new Vector(.6, .6);
        // take a look back
        this.wobble = Math.random() * Math.PI * 2;
    }
    Coin.prototype.type = "coin";

    Level.prototype.isFinished = function() {
        return this.status != null && this.finishDelay < 0;
    };

    function Level(plan) {
        this.width = plan[0].length;
        this.height = plan.length;
        this.grid = [];
        this.actors = [];

        for (var y = 0; y < this.height; y++) {
            var line = plan[y],
                gridLine = [];
            for (var x = 0; x < this.width; x++) {
                var ch = line[x],
                    fieldType = null;
                var Actor = actorchars[ch];
                if (Actor)
                    this.actors.push(new Actor(new Vector(x, y), ch));
                else if (ch === "x")
                    fieldType = "wall";
                else if (ch === "!")
                    fieldType = "lava";
                else if (ch === "|")
                    fieldType = "lava";
                else if (ch === "=")
                    fieldType = "lava";
                else if (ch === "v") {
                    fieldType = "lava";
                    console.log(fieldType);
                }
                gridLine.push(fieldType)
            }
            this.grid.push(gridLine);
        }
        this.player = this.actors.filter(function(actor) {
            return actor.type === "player"
        })[0];
        this.status = this.finishDelay = null;
    }

    function element(name, className) {
        var elem = document.createElement(name);
        if (className) elem.className = className;
        return elem;
    }

    function DOMDisplay(parent, level) {
        this.wrap = parent.appendChild(element("div", "game"));
        this.level = level;

        this.wrap.appendChild(this.drawBackground());
        this.actorLayer = null;
        this.drawFrame();
    }

    var scale = 15;

    DOMDisplay.prototype.drawBackground = function() {
        var table = element("table", "background");
        table.style.width = this.level.width * scale + "px";
        table.style.height = this.level.height * scale + "px";
        this.level.grid.forEach(function(row) {
            var rowElement = table.appendChild(element("tr"));
            rowElement.style.height = scale + "px";
            row.forEach(function(type) {
                rowElement.appendChild(element("td", type));
            });
        });
        return table;
    };

    DOMDisplay.prototype.drawActors = function() {
        var wrap = element("div");
        this.level.actors.forEach(function(actor) {
            var rect = wrap.appendChild(element("div", "actor " + actor.type));
            rect.style.width = actor.size.x * scale + "px";
            rect.style.height = actor.size.y * scale + "px";
            rect.style.left = actor.pos.x * scale + "px";
            rect.style.top = actor.pos.y * scale + "px";
        });
        return wrap;
    }

    DOMDisplay.prototype.drawFrame = function() {
        if (this.actorLayer)
            this.wrap.removeChild(this.actorLayer);
        this.actorLayer = this.wrap.appendChild(this.drawActors());
        this.wrap.className = "game " + (this.level.status || "");
        this.scrollPlayerIntoView();
    };

    // clear it later
    DOMDisplay.prototype.scrollPlayerIntoView = function() {
        var width = this.wrap.clientWidth;
        var height = this.wrap.clientHeight;
        var margin = width / 3;

        // The viewport
        var left = this.wrap.scrollLeft,
            right = left + width;
        var top = this.wrap.scrollTop,
            bottom = top + height;

        var player = this.level.player;
        var center = player.pos.plus(player.size.times(0.5))
            .times(scale);

        if (center.x < left + margin)
            this.wrap.scrollLeft = center.x - margin;
        else if (center.x > right - margin)
            this.wrap.scrollLeft = center.x + margin - width;
        if (center.y < top + margin)
            this.wrap.scrollTop = center.y - margin;
        else if (center.y > bottom - margin)
            this.wrap.scrollTop = center.y + margin - height;
    };

    DOMDisplay.prototype.clear = function() {
        this.wrap.parentNode.removeChild(this.wrap);
    };

    Level.prototype.obstacleAt = function(pos, size) {
        var xStart = Math.floor(pos.x);
        var xEnd = Math.ceil(pos.x + size.x);
        var yStart = Math.floor(pos.y);
        var yEnd = Math.ceil(pos.y + size.y);

        if (xStart < 0 || xEnd > this.width || yStart < 0)
            return "wall";
        if (yEnd > this.height)
            return "lava";
        for (var y = yStart; y < yEnd; y++) {
            for (var x = xStart; x < xEnd; x++) {
                var fieldType = this.grid[y][x];
                if (fieldType) return fieldType;
            }
        }
    };

    Level.prototype.actorAt = function(actor) {
        for (var i = 0; i < this.actors.length; i++) {
            var other = this.actors[i];
            if (other != actor &&
                actor.pos.x + actor.size.x > other.pos.x &&
                actor.pos.x < other.pos.x + other.size.x &&
                actor.pos.y + actor.size.y > other.pos.y &&
                actor.pos.y < other.pos.y + other.size.y)
                return other;
        }
    };

    var maxStep = 0.05;

    Level.prototype.animate = function(step, keys) {
        if (this.status != null)
            this.finishDelay -= step;

        while (step > 0) {
            var thisStep = Math.min(step, maxStep);
            this.actors.forEach(function(actor) {
                actor.act(thisStep, this, keys);
            }, this);
            step -= thisStep;
        }
    };

    Lava.prototype.act = function(step, level) {
        var newPos = this.pos.plus(this.speed.times(step));
        if (!level.obstacleAt(newPos, this.size))
            this.pos = newPos;
        else if (this.repeatPos)
            this.pos = this.repeatPos;
        else
            this.speed = this.speed.times(-1);
    };

    var wobbleSpeed = 8,
        wobbleDist = 0.07;

    Coin.prototype.act = function(step) {
        this.wobble += step * wobbleSpeed;
        var wobblePos = Math.sin(this.wobble) * wobbleDist;
        this.pos = this.basePos.plus(new Vector(0, wobblePos));
    };

    var playerXSpeed = 10;

    Player.prototype.moveX = function(step, level, keys) {
        this.speed.x = 0;
        if (keys.left) this.speed.x -= playerXSpeed;
        if (keys.right) this.speed.x += playerXSpeed;

        var motion = new Vector(this.speed.x * step, 0);
        var newPos = this.pos.plus(motion);
        var obstacle = level.obstacleAt(newPos, this.size);
        if (obstacle)
            level.playerTouched(obstacle);
        else
            this.pos = newPos;
    };

    var gravity = 30;
    var jumpSpeed = 17;

    Player.prototype.moveY = function(step, level, keys) {
        this.speed.y += step * gravity;
        var motion = new Vector(0, this.speed.y * step);
        var newPos = this.pos.plus(motion);
        var obstacle = level.obstacleAt(newPos, this.size);
        if (obstacle) {
            level.playerTouched(obstacle);
            if (keys.up && this.speed.y > 0)
                this.speed.y = -jumpSpeed;
            else
                this.speed.y = 0;
        } else {
            this.pos = newPos;
        }
    };

    Player.prototype.act = function(step, level, keys) {
        this.moveX(step, level, keys);
        this.moveY(step, level, keys);

        var otherActor = level.actorAt(this);
        if (otherActor)
            level.playerTouched(otherActor.type, otherActor);

        // Losing animation
        if (level.status == "lost") {
            this.pos.y += step;
            this.size.y -= step;
        }
    };

    Level.prototype.playerTouched = function(type, actor) {
        if (type == "lava" && this.status == null) {
            this.status = "lost";
            this.finishDelay = 1;
        } else if (type == "coin") {
            this.actors = this.actors.filter(function(other) {
                return other != actor;
            });
            if (!this.actors.some(function(actor) {
                return actor.type == "coin";
            })) {
                this.status = "won";
                this.finishDelay = 1;
            }
        }
    };

    var arrowCodes = {
        37: "left",
        38: "up",
        39: "right"
    };

    function trackKeys(codes) {
        var pressed = Object.create(null);

        function handler(event) {
            if (codes.hasOwnProperty(event.keyCode)) {
                var down = event.type == "keydown";
                pressed[codes[event.keyCode]] = down;
                event.preventDefault();
            }
        }
        addEventListener("keydown", handler);
        addEventListener("keyup", handler);
        return pressed;
    }

    function runAnimation(frameFunc) {
        var lastTime = null;

        function frame(time) {
            var stop = false;
            if (lastTime != null) {
                var timeStep = Math.min(time - lastTime, 100) / 1000;
                stop = frameFunc(timeStep) === false;
            }
            lastTime = time;
            if (!stop)
                requestAnimationFrame(frame);
        }
        requestAnimationFrame(frame);
    }

    var arrows = trackKeys(arrowCodes);

    function runLevel(level, Display, andThen) {
        var display = new Display(document.body, level);
        runAnimation(function(step) {
            level.animate(step, arrows);
            display.drawFrame(step);
            if (level.isFinished()) {
                display.clear();
                if (andThen)
                    andThen(level.status);
                return false;
            }
        });
    }

    function runGame(plans, Display) {
        function startLevel(n) {
            runLevel(new Level(plans[n]), Display, function(status) {
                if (status == "lost")
                    startLevel(n);
                else if (n < plans.length - 1)
                    startLevel(n + 1);
                else
                    alert("You win!");
            });
        }
        startLevel(0);
    }

    runGame(LEVELS, DOMDisplay);
</script>

</body>
</html>
